The grip stop ring on the G2 tube is a few mm farther away from the housing than the OEM tube. A ProGrip gel Superbike grip bottoms out with some overhang on the end of the tube. This was of no concern and everything fit perfect and worked smooth, I had filed the locator off the housing but it would have lined up anyway. If this bothers you you could either trim the stop ring off, or cut the grip end flush with the tube, but its not neccessary.
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'08 Ducati Hypermotard 1100
'07 GasGas EC250